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Some rain bands sweeping down the North Island will start to break up today but others will "flare up" as a large low in the Tasman continues to cause chaos to parts of New Zealand, says WeatherWatch head weather forecaster Philip Duncan​.

Fresh thunderstorms have also been issued.

"It's a complicated set-up but latest guidance shows rain off and on this morning, with a mix of normal and heavy falls," he said.

"The rain clouds break up further this afternoon and gradually clear tonight for many, but not all."

Some parts of Auckland and Coromandel had a month's worth of rain overnight.

Duncan said a large high in the South Island may help push the rain back out to sea today or tonight.

"However on Thursday the rain will be hovering just north of the North Island, possibly not clearing all of Northland or Coromandel Peninsula - then sliding back into the upper North Island across Thursday as the high and low pressure systems work together to create a wet nor'easter from Waikato and Bay of Plenty northwards."

"This rain could again become heavy and is worth monitoring - especially Coromandel Peninsula. However it may then clear yet again overnight for a time."

He said much of Northland and most Auckland escaped the worst of the overnight deluge, but those parts of Auckland and Coromandel Peninsula that were hit by floods had more than a month's worth of rain in the past 24 hours.

"These localised downpours are typical with a sub-tropical event like this."